J/ψ→VP衰变过程耦合常数性质的研究  

Study on the coupling constant of J/ψ→VP decays

作　　者：黄金书[1,2] 孙俊峰[2] 鲁公儒[2] 

机构地区：[1]南阳师范学院物理与电子工程学院,河南南阳473061 [2]河南师范大学物理与信息工程学院,河南新乡453007

出　　处：《南阳师范学院学报》2012年第9期20-26,共7页Journal of Nanyang Normal University

基　　金：国家自然科学基金(10979008);河南省高校科技创新人才支持计划(2012HASTIT030)

摘　　要：基于不同实验组给出的J/ψ→VP的分支比,对衰变过程耦合常数的性质进行了研究.发现八重态的强作用耦合强度参数g8大约是单态的强作用耦合参数g1的2倍;引起SU(3)破缺的电磁效应的耦合常数较大,其三个耦合常数差别并不明显,而引起SU(3)破缺的质量效应的耦合常数较小,同时这三个耦合常数相差很大,而且不确定性也大;强作用与电磁作用之间的相角大约在70°～80°之间;这使我们对J/ψ→VP衰变过程耦合常数的性质有了更加深入的了解.Based on the branching fractions of J/ψ→VP from different experiments, we study on the coupling constants of J/ψ→VP decays. We find that the octet coupling constant of strong interaction g8 is about twice of the singlet coupling constant g1 ; the electromagnetic breaking term gE is larger the mass breaking term gM, more-over, the three parameters of electromagnetic breaking term are about equal, but the three parameters of mass breaking term are different and their uncertainty are also large;and the phase angle between strong interaction and electromagnetic interaction is about between 70°and 80° It makes us enhance the understanding of the coupling constant of J/ψ→VP decays.

关 键 词：J/Ψ衰变 混合角 耦合常数 拟合 

分 类 号：O572.2[理学—粒子物理与原子核物理]